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Deformed shape estimation for flexible composite marine propellers by image registration

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Abstract

The authors have recently developed a 3D shape measurement method using a combination line charge-coupled device (CCD) camera that can accurately measure 3D shapes underwater. This method can precisely measure the deformation of flexible composite marine propellers. The authors measured the deformation of a flexible model propeller fabricated with a 3D printer. To utilize the results of the deformation measurement as verification data for fluid–structure interaction calculation, not only the amount of deformation but also the deformed 3D blade shape is necessary. The authors have developed an estimation method for the deformed blade shape of flexible composite marine propellers. The authors focus on a feature that the deformed blade shape can be represented by the position change of the wing section and developed an estimation method for the deformed blade shape by image registration. To verify the system’s effectiveness, model experiments were conducted in the NMRI’s large cavitation tunnel using the highly skewed propeller (HSP) of a training ship “SEIUN-MARU I”. Comparing the results of experiments and numerical simulation, the authors show the effectiveness of the developed estimation method.

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Data availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This research was partially supported by the Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Scientific Research (C) JP19K04871 and JP 22H01708. We express our gratitude to Mr. Koyu Kimura at Akishima Laboratories (Mitsui Zosen) Inc. for lending the CFRP model propeller.

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Authors and Affiliations

  1. National Maritime Research Institute (NMRI), Tokyo, Japan

    Koichiro Shiraishi, Yuki Sawada & Daijiro Arakawa

Authors
  1. Koichiro Shiraishi
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  2. Yuki Sawada
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  3. Daijiro Arakawa
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Correspondence to Koichiro Shiraishi.

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Appendix: Deformation measurement in the ship’s wake

Appendix: Deformation measurement in the ship’s wake

Deformation measurements were conducted in the SEIUN-MARU wake with varying propeller phase angles. The rotation speed of the model propeller was 22.0 rps. The experimental conditions were the same as those described in Sect. 3.2, except for the propeller phase angle. The black dots in Fig. 

Fig. 18
figure 18

Wake distribution of SEIUN-MARU

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18 show the marker position before deformation (Base). The pink, blue, brown, green, orange and red dots represent the measurement results at phase angles of 0 deg., 10 deg., 20 deg., 30 deg., 40 deg. and 45 deg., respectively.

Figure 

Fig. 19
figure 19

Results of propeller deformation measurement. (phase angle effect, np = 22.0 [rps], Phase angle = 0.0, 10.0, 20.0, 30.0, 40.0, 45.0 [deg.])

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19 shows the measured positions of the blade cross section at each radial position in the x–y plane. Figures 15 and 16 show the measured positions of the blade cross section at each radial position in the x–y plane. The model propeller is bent in the back plane (-x direction).

See Appendix Figs. 18,

Fig. 20
figure 20

Results of propeller deformation measurement. (phase angle effect, np = 22.0 [rps], phase angle = 0.0, 10.0, 20.0, 30.0, 40.0, 45.0 [deg.])

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20,

Fig. 21
figure 21

Comparison propeller surface of original shapes and deformed shapes on the x–y plane (phase angle effect: 0.6R, 0.7R, 0.8R, 0.9R, 0.95R)

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21

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Shiraishi, K., Sawada, Y. & Arakawa, D. Deformed shape estimation for flexible composite marine propellers by image registration. J Mar Sci Technol 28, 221–233 (2023). https://doi.org/10.1007/s00773-022-00918-1

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